Hydraulic shovel operability range display device and method for controlling same

Abstract

In a hydraulic shovel operability range display device, a calculation unit is configured to set a boundary between an operability range and an underbody area along a vertical direction in a global coordinate system when a vehicle body is horizontally oriented. When the vehicle body is tilted forward, the calculation unit is configured to set the boundary so as to be maintained along the vertical direction in the global coordinate system. When the vehicle body is tilted backwards, the calculation unit is configured to correct the boundary between the operability range and the underbody area so that an angle formed by the boundary and the ground surface on which the vehicle body is positioned is at least 90°.

The invention claimed is: 
     
       1. An operability range display device in a hydraulic shovel including a work machine and a vehicle body, the operability range display device comprising:
 a calculation unit configured to calculate an operability range in which an underbody area positioned underneath the vehicle body is excluded from a reachable range indicating a range that can be reached by the work machine; and 
 a display unit configured and arranged to display the operability range, 
 the calculation unit being configured to set a boundary of the operability range and the underbody area along a vertical direction in a global coordinate system when the vehicle body is horizontally oriented, to set the boundary of the operability range and the underbody area so as to be maintained along the vertical direction in the global coordinate system when the vehicle body is tilted forward, and to correct the boundary of the operability range and the underbody area so that an angle formed by the boundary and a ground surface on which the vehicle body is positioned is at least 90° when the vehicle body is tilted backwards. 
 
     
     
       2. A method for controlling an operability range display device in a hydraulic shovel including a work machine and a vehicle body, comprising:
 a calculating unit calculating an operability range in which an underbody area positioned underneath the vehicle body is excluded from a reachable range indicating a range that can be reached by the work machine; and 
 a display unit displaying the operability range, 
 the calculating of the operability range includes setting a boundary of the operability range and the underbody area along a vertical direction in a global coordinate system when the vehicle body is horizontally oriented, setting the boundary of the operability range and the underbody area so as to be maintained along the vertical direction in the global coordinate system when the vehicle body is tilted forward, and correcting the boundary of the operability range and the underbody area so that an angle formed by the boundary and a ground surface on which the vehicle body is positioned is at least 90° when the vehicle body is tilted backwards.